28240448 has 14 divisors (see below), whose sum is σ = 56039766. Its totient is φ = 14120192.

The previous prime is 28240447. The next prime is 28240453. The reversal of 28240448 is 84404282.

It can be written as a sum of positive squares in only one way, i.e., 28217344 + 23104 = 5312^2 + 152^2 .

It is a super-3 number, since 3×28240448³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (28240447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220565 + ... + 220692.

Almost surely, 2^28240448 is an apocalyptic number.

It is an amenable number.

28240448 is a deficient number, since it is larger than the sum of its proper divisors (27799318).

28240448 is an equidigital number, since it uses as much as digits as its factorization.

28240448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441269 (or 441259 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 28240448 is about 5314.1742538234. The cubic root of 28240448 is about 304.5256372424.

The spelling of 28240448 in words is "twenty-eight million, two hundred forty thousand, four hundred forty-eight".